\\[-1.8ex] Soil Heterogeneity & $-$0.037$^{*}$ & $-$0.023 & $-$0.027$^{*}$ & $-$0.018 & $-$0.035$^{*}$ & $-$0.011 \\ 
  & (0.020) & (0.019) & (0.016) & (0.016) & (0.019) & (0.015) \\ 
\\[-1.8ex] 
Observations & 14,731 & 14,731 & 14,731 & 14,731 & 14,731 & 14,731 \\ 
R$^{2}$ & 0.656 & 0.699 & 0.683 & 0.692 & 0.657 & 0.725 \\ 
